Device for locking electric-lamp bulbs in receptacles.



F.JORDAN. ,DEVICE FOR LOCKING ELECTRIC LAMP BULB$ IN RECEPTACLES.

APPLICATION FILED MAY.14, 1915. v

Patented June 13, 1916.

mpemtoz,

as P ENT orni on.

FORREST JORDAN, OF SAN FRANCISCO, CALIFORNIA;

DEVICE FOR LOCKING ELECTRIC-LAMP BULBS IN RECEPTAC-LES.

Specification of Letters Patent.

Application and ma 14, 1915; Serial No. 28,228. i

To all whom it may concern Be it known that I, Fonnns'r JORDAN, a citizen of the United States of America, re-

siding at San Francisco, in. the county of San Francisco and State of California, have invented new and usefullmprovements in Devices for Locking Electric-Lamp Bulbs in Receptacles, of. which the following is a specification.

This invention relates to improvements in locking devices for locking electric lamp bulbs in their receptacles.

In carrying out the present invention, it

is my purpose to provide alocking device.

ofthe class'described whereby the lamp bulb will be effectively and securely locked within the receptacle so as to prevent removal of the bulb from the socket and whereby a fluid tight joint will be formed 'at the connection between the bulb and receptacle so as to prevent the entrance of water,'steam and other foreign matter into the receptacle. I

It is also my purpose toprovide a device of the type set forth which may be readily applied to the receptacle and removedltherefrom and which will embody comparatively few parts and these so correlated and .arranged as to reduce the possibility of derangement to a minimum. v

With the above and other objects in view,

the invention consists in the construction,

combinationand arrangement of parts hereinafter setforth in and falling within the scope of the claim.

In the accompanying drawing: Figure 1 is a View in side elevation of an electric lamp bulb and receptacle equipped'with a locking device constructed in accordance with the present invention. longitudinal sectional view through the same. Fig. 3 is a cross sectional view therethrough. Fig. 4 isa perspective view of the locking device removed from the receptacle.

Referring now to the drawing in detail, 1 designates an electric lamp receptacle of the usual key operated switch type, while 2 indicates an incandescent lamp bulb having the butt threaded into the receptacle 1 so that the current may be delivered to the filament of the lamp when the key switch is actuated to circuit closing position.

My improved locking'device .is indicated as an entirety at 3 and this device comprises a locking collar 4; formed of two sections 5,

Fig. 2 is a- 6. One endof each section 5, 6-is formed with an outwardly projecting pivot ear 7 and through the pivot ears 7 is passed a pivot pin 8 about which the sections and 6 may be swung to open and-closed positions. The remaining ends of the sections 5 and 6 are equipped with. looking ears 9. In the present instance, a locking screw 10 is rotatably mounted within the locking ear 9. on the section 5 and is adapted to enteran opening 11' formed in the ear 9 on the Patented June 13, 1916.

section 6 and formed on the section 5 and.

surrounding the head of the locking screw 10 is a casing 12 having the end wall thereof formed with a slot '13. a

14 designates a key having the end of the shank 15 formed with a screw driver edge 16, and the opposite side edges thereof formed with notches 17 so that the shank of the key may be rotated when the screw driver edge thereof is inserted in the casing 12 through the slot 13. Surrounding the butt of the lamp and disposed'in contact with the edge of the receptacle is an elastic washer 18, while formed in the inner surfaces of the sections 5 and 6 of the col lar 4 are corresponding grooves 19 adapted .to receive the washer and correspondingtacle and the sections drawn together.'

When the sections are drawn together the grooves 19 receive the washer, while the grooves 20 take the bead on the adjacent end of the receptacle. The key isv now inserted through the slot 13 and the screw 10 rotated to engage the threads of the opening 11 and in the continued rotation of the screw the sections of the collar are drawn together and the elastic washer 18 compressed. Thus, the lamp bulb is securely and effectively locked to the receptacle.

If desired, the collar 4 may be formed of,

a circumferentially enlarged section having the grooves 20 formedtherein and a relatively small section having the grooves 19 therein so that the locking collar may be applied to'porcelain or other large receptacles.

I claim: I A locking device of the class described comprising a collar adapted to surround the lamp end of a receptacle to hold the lamp within the receptacle, said collar being formed of two sections capable of movement to open and closed positions, a pivotal connection between said sections at corresponding ends thereof, locking ears on the remaining ends of said sections, a locking screw threaded through said locking ears and having a slotted head, a casing formed on one of said locking ears and surrounding the head of said locking screw and formed with a slot through which a key may be inserted to engage the slotted head of the locking screw to actuate the latter to 

